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## --------------------------------- ##
## Check if --with-regex was given. ##
## --------------------------------- ##
# Copyright 1996, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.
# serial 2
# AM_WITH_REGEX
# -------------
#
# The idea is to distribute rx.[hc] and regex.[hc] together, for a
# while. The WITH_REGEX symbol is used to decide which of regex.h or
# rx.h should be included in the application. If `./configure
# --with-regex' is given (the default), the package will use gawk's
# regex. If `./configure --without-regex', a check is made to see if
# rx is already installed, as with newer Linux'es. If not found, the
# package will use the rx from the distribution. If found, the
# package will use the system's rx which, on Linux at least, will
# result in a smaller executable file.
#
# FIXME: This macro seems quite obsolete now since rx doesn't seem to
# be maintained, while regex is.
AC_DEFUN([AM_WITH_REGEX],
[ifdef([AC_LIBSOURCES],
[AC_LIBSOURCES([rx.h, rx.c, regex.c, regex.h])])dnl
AC_MSG_CHECKING([which of GNU rx or gawk's regex is wanted])
AC_ARG_WITH(regex,
[ --without-regex use GNU rx in lieu of gawk's regex for matching],
[test "$withval" = yes && am_with_regex=1],
[am_with_regex=1])
if test -n "$am_with_regex"; then
AC_MSG_RESULT(regex)
AC_DEFINE(WITH_REGEX, 1, [Define if using GNU regex])
AC_CACHE_CHECK([for GNU regex in libc], am_cv_gnu_regex,
[AC_TRY_LINK([],
[extern int re_max_failures; re_max_failures = 1],
[am_cv_gnu_regex=yes],
[am_cv_gnu_regex=no])])
if test $am_cv_gnu_regex = no; then
LIBOBJS="$LIBOBJS regex.$ac_objext"
fi
else
AC_MSG_RESULT(rx)
AC_CHECK_FUNC(re_rx_search, , [LIBOBJS="$LIBOBJS rx.$ac_objext"])
fi
AC_SUBST(LIBOBJS)dnl
])
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